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Seismic Microzonation: Principles, Practices and Experiments Seismic Microzonation: Principles, Practices and Experiments T. G. Sitharam Professor, Department of Civil Engineering ,Indian Institute of Science, Bangalore, India-560012 [email protected] P. Anbazhagan Lecturer, Department of Civil Engineering ,Indian Institute of Science, Bangalore, India-560012 [email protected] ABSTRACT This paper presents an overview of the seismic microzonation and the grade/level based study along with methods used for estimating hazard. The principles of seismic microzonation along with some current practices are discussed. Summary of seismic microzonation experiments carried out in India is presented. A detailed work of seismic microzonation of Bangalore has been presented as a case study. In this case study, a seismotectonic map for microzonation area has been developed covering 350 km radius around Bangalore, India using seismicity and seismotectonic parameters of the region. For seismic microzonation Bangalore Mahanagar Palike (BMP) area of 220 km2 has been selected as the study area. Seismic hazard analysis has been carried out using deterministic as well as probabilistic approaches. Synthetic ground motion at 653 locations, recurrence relation and peak ground acceleration maps at rock level have been generated. A detailed site characterization has been carried out using borehole with standard penetration test (SPT) ―N‖ values and geophysical data. The base map and 3-dimensional sub surface borehole model has been generated for study area using geographical information system (GIS). Multichannel analysis of surface wave (MASW) method has been used to generate one-dimensional shear wave velocity profile at 58 locations and two-dimensional profile at 20 locations. These shear wave velocities are used to estimate equivalent shear wave velocity in the study area at every 5m intervals up to a depth of 30m. Because of wider variation in the rock depth, equivalent shear for the soil overburden thickness alone has been estimated and mapped using ArcGIS 9.2. Based on equivalent shear wave velocity of soil overburden thickness, the study area is classified as ―site class D‖. Site response study has been carried out using geotechnical properties and synthetic ground motions with program SHAKE2000. The soil in the study area is classified as soil with moderate amplification potential. Site response results obtained using standard penetration test (SPT) ―N‖ values and shear wave velocity are compared, it is found that the results based on shear wave velocity is lower than the results based on SPT ―N‖ values. Further, predominant frequency of soil column has been estimated based on ambient noise survey measurements using instruments of L4-3D short period sensors equipped with Reftek 24 bit digital acquisition systems. Predominant frequency obtained from site response study is compared with ambient noise survey. In general, predominant frequencies in the study area vary from 3Hz to 12Hz. Due to flat terrain in the study area, the induced effect of land slide possibility is considered to be remote. However, induced effect of liquefaction hazard has been estimated and mapped. Finally, by integrating the above hazard parameters two hazard index maps have been Bouquet 08 2 developed using Analytic Hierarchy Process (AHP) on GIS platform. One map is based on deterministic hazard analysis and other map is based on probabilistic hazard analysis. Finally, a general guideline is proposed by bringing out the advantages and disadvantages of different approaches. KEYWORDS: Seismic microzonation, hazard, site characterization, site response INTRODUCTION Many earthquakes in the past have left many lessons to be learned which are very essential to plan infrastructure and even to mitigate such calamities in future. The hazards associated with earthquakes are referred to as seismic hazards. The practice of earthquake engineering involves the identification and mitigation of seismic hazards. Microzonation has generally been recognized as the most accepted tool in seismic hazard assessment and risk evaluation and it is defined as the zonation with respect to ground motion characteristics taking into account source and site conditions [TC4-ISSMGE, 1999]. Making improvements on the conventional macrozonation maps and regional hazard maps, microzonation of a region generates detailed maps that predict the hazard at much smaller scales. Seismic microzonation is the generic name for subdividing a region into individual areas having different potentials hazardous earthquake effects, defining their specific seismic behavior for engineering design and land-use planning. The role of geological and geotechnical data is becoming very important in the microzonation in particular the planning of city urban infrastructure, which can recognize, control and prevent geological hazards (Bell et al., 1987; Legget, 1987; Hake, 1987; Rau, 1994; Dai et al., 1994, 2001; Van Rooy and Stiff, 2001). The basis of microzonation is to model the rupture mechanism at the source of an earthquake, evaluate the propagation of waves through the earth to the top of bed rock, determine the effect of local soil profile and thus develop a hazard map indicating the vulnerability of the area to potential seismic hazard. Seismic microzonation will also help in designing buried lifelines such as tunnels, water and sewage lines, gas and oil lines, and power and communication lines. In the last three decades, large earthquakes have caused massive loss of lives and extensive physical destruction throughout the world (Armenia, 1988; Iran, 1990; US, 1994; Japan, 1995; Turkey, 1999; Taiwan, 1999, India 2001, Sumatra 2004, Pakistan, 2005). India has been facing threat from earthquakes since ancient times. In India, the recent destructive earthquakes are Killari (1993) Jabalpur (1997) Bhuj (2001) Sumatra (2004) and Indo-Pakistan (2005). Seismic activity of India is evident from these recent earthquakes within the intra plate and along the boundaries of Indo-Australian Plate and Eurasian Plate. Many researchers address the intra plate earthquakes and seismicity of South India (Purnachandra Rao, 1999; Ramalingeswara Rao, 2000; Iyengar and Raghukanth, 2004). Very preliminary process of reducing the effects of earthquake is by assessing the hazard itself. As part of the national level microzonation programme, Department of Science and Technology, Govt. of India has initiated microzonation of 63 cities in India (Bansal and Vandana, 2007). Some of them are finished and some of them are ongoing. As an initial experiment, seismic hazard analysis and microzonation was taken up for Jabalpur city in Madhaya Pradesh. Further, for many other cities such as Sikkim, Mumbai, Delhi, North East India, Gauwhati, Ahmedabad, Bhuj, Dehradun and Chennai an attempt has been made to carryout microzonation considering geomorphological features and detailed geotechnical studies. Among the above Jabalpur, Sikkim, Gauwhati and Bangalore microzonation works have been completed. However, for Sikkim and Gauwhati, microzonation reports are already available and the report on microzonation of Bangalore is in the final stages which will be released within few months. Bouquet 08 3 This paper presents the state-of-art practices of microzonation along with brief summary of the Indian experiments. Further, a detailed case study of seismic microzonation of Bangalore has been presented. Seismic microzonation of Bangalore is addressed in four parts: In the first part, estimation of seismic hazard using seismotectonic and geological information. Second part deals about the site characterization using geotechnical and shallow geophysical techniques. In the third part, local site effects are assessed by carrying out one-dimensional (1-D) ground response analysis (using the program SHAKE 2000) using both borehole SPT data and shear wave velocity survey data within an area of 220 km2. Further, field experiments using microtremor studies have also been carried out (jointly with NGRI) for evaluation of predominant frequency of the soil columns. The same has been assessed using 1-D ground response analysis and compared with microtremor results. Further, Seed and Idriss simplified approach has been adopted to evaluate the liquefaction susceptibility and liquefaction resistance assessment. As the study area is fairly flat in most of the region except in north and northwestern, landslide possibility is considered as remote. Fourth part discuss about the integration of all the hazard parameters and developing a final hazard index map for BMP area using Analytic Hierarchy Process (AHP) on GIS (Geographical Information System) platform. PRINCIPLES OF SEISMIC MICROZONATION The earthquake damage basically depends on three groups of factors: earthquake source and path characteristics, local geological and geotechnical site conditions, structural design and construction features. Seismic microzonation should address the assessment of the first two groups of factors. In general terms, seismic microzonation is the process of estimating the response of soil layers for earthquake excitations and thus the variation of earthquake characteristics is represented on the ground surface. Seismic microzonation is the initial phase of earthquake risk mitigation and requires multidisciplinary approach with major contributions from geology, seismology and geotechnical engineering. Seismic Microzonation falls into the category of ―applied research‖. That is why it needs to be upgraded and revised based on the latest information.
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